<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<ul type="square">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>
<ul type="circle">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>
<ul>
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ul>

<ol type="I" start="8">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>
<ol type="A" start="6">
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>
<ol>
    <li>python</li>
    <li>html</li>
    <li>css</li>
    <li>javascript</li>
</ol>
<hr>
<table border="1px" width="500px">
    <thead>
        <tr>
            <th>head</th>
            <th>head</th>
            <th>head</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>aaa</td>
            <td>aaa</td>
            <td>aaa</td>
        </tr>
        <tr>
            <td>bbb</td>
            <td>bbb</td>
            <td>bbb</td>
        </tr>
        <tr>
            <td>ccc</td>
            <td>ccc</td>
            <td>ccc</td>
        </tr>
    </tbody>
    <tfoot>
        <tr>
            <td>111</td>
            <td>111</td>
            <td>111</td>
        </tr>
    </tfoot>
</table>
<hr>
<table border="1px" width="500px">
    <tr>
        <td>id</td>
        <td>lesson</td>
        <td>content</td>
    </tr>
    <tr>
        <td>1</td>
        <td>linux</td>
        <td>linux system</td>
    </tr>
    <tr>
        <td>2</td>
        <td>shell</td>
        <td>shell script</td>
    </tr>
    <tr>
        <td>3</td>
        <td>python</td>
        <td>python programing</td>
    </tr>
    <tr>
        <td>4</td>
        <td>web</td>
        <td>html + css</td>
    </tr>
    <tr>
        <td rowspan="2">111</td>
        <td colspan="2">111</td>
    </tr>
    <tr>
        <td>222</td>
        <td>222</td>
    </tr>
</table>
</body>
</html>